UK: Caerbont Automotive Instruments (CAI), continues to produce classic Smiths-branded instruments with the blessing of Smiths Group plc. CAI is the oldest established automotive gauge maker in the world, and the UK's largest independent. We supply such prestige marquees as Aston Martin, Rolls Royce and Lotus. CAI was formerly the SMITHS Instrument Company, which was the supplier of choice for the classic British Sports cars of the 50's, 60's and 70's.